Abstract
As the quotation from R. Park's 1928 work demonstrates, sociologists have a rather longstanding interest in migration and its consequences, in “the conflicts and fusions of peoples.” The period of relative tranquility between 1925 and 1955 was followed by a marked resurgence of ethnicity and a revitalization of international migrations during the 1960s and 1970s. Neither of these phenomena was confined to the Western Hemisphere or the new countries in Africa and Asia, but included a revival of ethnic mobilization in such nationstates as Great Britain, France, and Spain and the migration of millions of workers from southern Europe to the advanced industrial countries in northern Europe.